THR's Power Business Managers 2013

"I never tell a client no," says Feldstein, whose clients include Dr. Dre, SelenaGomez, AdamLevine, LennyKravitz and his own son, JonahHill. "I give them the facts and offer up my recommendation. Sometimes the client will appreciate that and say, 'Thank you, but I'm going to do it anyway.' "

Regardless, Feldstein's philosophy is not to pull punches. "We're getting paid for our advice," he says. "If I don't offer up my true feelings, I'm not doing my job." Another piece of strategy? Avoid litigation, he says. "In the halls of justice, the wheels grind very slowly."